Editing L2

'''L2''', '''L<sup>2</sup>''', '''L02''', '''L II''', '''L.2''' or '''L-2''' may refer to:
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==Astronomy==
* [[L2 point|L<sub>2</sub> point]], second Lagrangian point in a two body orbiting system
* [[L2 Puppis|L<sub>2</sub> Puppis]], star which is also known as HD 56096
* [[Advanced Telescope for High Energy Astrophysics]], a proposed X-ray telescope

== Biology ==
* [[Haplogroup L2 (mtDNA)]] in human genetics
* [[ATC code L02]] ''Endocrine therapy'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* the second [[lumbar vertebrae]] of the vertebral column in human anatomy
* the second larval stage in the ''[[Caenorhabditis elegans]]'' worm development

==Computing==
* [[L2 cache]], the Level-2 CPU cache in a computer
* Layer 2 of the [[OSI model]], in computer networking
* [[L2 (operating system)]], or Liedtke 2 (a.k.a. EUMEL/ELAN), a persistent microkernel operating system developed by German computer scientist Jochen Liedtke
* [[L2 (programming language)]]
* [[ISO/IEC 8859-2]] (Latin-2), an 8-bit character encoding

== Entertainment ==
* [[L2 (music group)]], an American pop duo
* ''[[L2: Empuraan]]'', a 2025 Indian film, also called ''L2E''
* ''[[Leprechaun 2]]'', a 1994 American film
* ''[[Lineage II]]'', a 2003 MMO game
* ''[[Lumines II]]'', a 2006 puzzle game

==Mathematics==
* The [[L2 space|''L''<sup>2</sup> space]] of square-integrable functions
* [[Norm (mathematics)#p-norm|''L''<sup>2</sup> norm]]
* The [[Hilbert space#Sequence spaces|ℓ<sup>2</sup>]] space of square-summable sequences
* [[L² cohomology|''L''<sup>2</sup> cohomology]], a cohomology theory for smooth non-compact manifolds with Riemannian metric
* {{math|''L''{{sub|2}}(''n'')}}, the family of 2-dimensional [[projective special linear group]]s on finite fields.
* [[Ridge regression]], regression and regularization method also known as L2 regularization

== Technology and weapons ==
* a variety of [[low-alloy special purpose steel]]
* a [[L-carrier]] cable system developed by AT&T
* a series of fragmentation [[hand grenade]]s used by the British armed forces (American [[M61 grenade|M61]] copies), before being replaced by the [[L109]] grenade
* the L designation given to the [[Sterling submachine gun]] in the British armed forces
* a frequency used in GPS satellite navigation signals, see [[GPS signals]], a newer version is the [[L2C]] frequency

== Transportation ==
===Aircraft===
* [[LZ 18 (L 2)]], a short-lived 1913 German airship (Imperial Navy designation: ''L 2'')
* [[Arado L II]], a 1929 German model of high-wing sporting monoplane
* [[ASJA L2]], a pair of 1932 Swedish trainer biplanes
* [[Lawson L-2]], a 1920 American biplane airliner
* [[Macchi L.2]], an Italian model of biplane flying boat
* [[L-2 Grasshopper]], an American Taylorcraft model used in WWII
* [[PZL Ł.2]], a 1929 Polish model of liaison aircraft

===Aviation===
* [[Junkers L2]], an engine model; precursor to the Junkers L5
* [[Lynden Air Cargo]], Alaskan airline (IATA code: L2)
* [[Walker County Airport]] (or ''Bevill Field''), Alabama, U.S. (former FAA LID: L02)

===Rail locomotives===
* [[Chesapeake and Ohio Class L-2 and L-2a]], an American 4-6-4 "Hudson" type steam locomotives model
* [[Milwaukee Road class L2]], an American 2-8-2 "Mikado" type steam locomotive
* [[SP&S Class L-2]], an 1881 steam locomotives class
* [[LNER Class L2]], a 1925 class of 2-6-4Ts

===Other modes of transport===
* [[L2 (New York City bus)]], a temporary bus route in New York City, U.S.
* The Randwick branch of the [[CBD and South East Light Rail]] in Sydney, Australia, numbered L2

== Other uses ==
* [[Second language]] (L2), a non-native, acquired tongue of an individual
* [[L²]], a Flemish political youth organization
* [[L-2 visa]], a U.S. travel document for dependents of temporary workers
* a [[List of North American broadcast station classes#FM|class of FM radio broadcasting in North America]]
* [[Ligue 2]], a French association football league
* [[L2 Inc]], an American market research company

==See also==
* [[2L (disambiguation)]]
* [[LII (disambiguation)]]
* [[Level 2 (disambiguation)]]

{{Letter-Number Combination Disambiguation}}